A SIG SAUER 556 IN 223/5.56.Takes ar-15 mags,two stage trigger.Around 250 rounds fired(most likely less).A few handling marks.comes with 1-30 round Sig mag and "connector",case.owners manual(if I can find it).Original owner.Shipping actual costs.FFL TO FFL $25 extra.If you have no transaction history please do not click buy it now without contacting me first.Payment should be made promptly.USPS POSTAL MONEY ORDER